JOP124 Eruptive filament in active region :
II- Oscillations in Filaments and Prominences"
(Sep. 2000, updated version)
22 April 2003, SOC added preference for 304 Å CME Watch for EIT
S.Regnier, J.Solomon, J.C.Vial
P.Lemaire (SUMER)
D.Pike (CDS)
Purpose
To find long period oscillations in filaments and prominences, and to obtain
temperature, density of these structures.
Method
We plan to do long time observations (~7h) of a filament or of a prominence
with a high temporal resolution (less than 30s) in the HeI line at 584.33A
(CDS, SUMER), in the HeII line at 304A (CDS). Temperature and density
diagnostics of a prominence is obtain by CDS.
Scientific Objective
We have found with SUMER long period oscillations in active region filament (a
period range between 55min and 2h20min) in the HeI line at 584.33A (see
Regnier et al., 2000). We would like to compare these oscillations in an
active region filament with new observation of oscillations in quiescent
filament or in prominences. On the other hand, we compared observational
periods with a prominence model (Joarder & Roberts, 1992). Some parameters
could be observed as temperature and density, the angle between the filament
and the magnetic field supporting the filament, the width and the length of
the filament.
References
Joarder, P.S., Roberts, B., 1992, A&A, 277, 225
Regnier, S., Solomon, J, Vial, J.C., 2000, A&A, in preparation
Observing program :
SUMER and CDS (studies 1 and 2) observe the same structure.
SUMER : HeI at 584.33A
temporal resolution : ~30s
slit : 0.3"x120"
no rotation compensation
CDS : 3 studies
1- Context raster
field of view : 2'x4'
slit : 4"x240"
3 lines : HeI at 584.33A, HeII at 304A, OIII at 599A
duration : ~10min
2- same lines
slit : 2"x240"
without raster
temporal resolution : ~25s
duration : ~12min (30 exposures)
3- diagnostic
slit : 2"x240"
field of view : 240"x240"
lines : HeI (584.33A), SiIX (349A and 341A), FeXVI (360A), OV (629A),
NeV (359A and 572A), SiXI (604A and 580A), NeVI (562A)
duration : 110min
EIT : 304 Å CME Watch (half res) preferable